class Snowflake {
    constructor() {
        this.x = 0;
        this.y = 0;
        this.vx = 0;
        this.vy = 0;
        this.radius = 0;
        this.alpha = 0;

        this.reset();
    }

    reset() {
        this.x = this.randBetween(0, window.innerWidth);
        this.y = this.randBetween(0, -window.innerHeight);
        this.vx = this.randBetween(-3, 3);
        this.vy = this.randBetween(2, 5);
        this.radius = this.randBetween(1, 4);
        this.alpha = this.randBetween(0.1, 0.9);
    }

    randBetween(min, max) {
        return min + Math.random() * (max - min);
    }

    update() {
        this.x += this.vx;
        this.y += this.vy;

        if (this.y + this.radius > window.innerHeight) {
            this.reset();
        }
    }
}

class Snow {
    constructor() {
        this.canvas = document.createElement("canvas");
        this.ctx = this.canvas.getContext("2d");

        document.body.appendChild(this.canvas);

        window.addEventListener("resize", () => this.onResize());
        this.onResize();
        this.updateBound = this.update.bind(this);
        requestAnimationFrame(this.updateBound);

        this.createSnowflakes();
    }

    onResize() {
        this.width = window.innerWidth;
        this.height = window.innerHeight;
        this.canvas.width = this.width;
        this.canvas.height = this.height;
    }

    createSnowflakes() {
        const flakes = window.innerWidth / 4;

        this.snowflakes = [];

        for (let s = 0; s < flakes; s++) {
            this.snowflakes.push(new Snowflake());
        }
    }

    update() {
        this.ctx.clearRect(0, 0, this.width, this.height);

        for (let flake of this.snowflakes) {
            flake.update();

            this.ctx.save();
            this.ctx.fillStyle = "#FFF";
            this.ctx.beginPath();
            this.ctx.arc(flake.x, flake.y, flake.radius, 0, Math.PI * 2);
            this.ctx.closePath();
            this.ctx.globalAlpha = flake.alpha;
            this.ctx.fill();
            this.ctx.restore();
        }
        requestAnimationFrame(this.updateBound);
    }
}

new Snow();


////////////////////////////////////////////////////////////

// Simple CountDown Clock

const comingdate = new Date("Jan 1, 2019 00:00:00");

const d = document.getElementById("d");
const h = document.getElementById("h");
const m = document.getElementById("m");
const s = document.getElementById("s");

const countdown = setInterval(() => {
    const now = new Date();
    const des = comingdate.getTime() - now.getTime();
    const days = Math.floor(des / (1000 * 60 * 60 * 24));
    const hours = Math.floor((des % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    const mins = Math.floor((des % (1000 * 60 * 60)) / (1000 * 60));
    const secs = Math.floor((des % (1000 * 60)) / 1000);

    d.innerHTML = getTrueNumber(days);
    h.innerHTML = getTrueNumber(hours);
    m.innerHTML = getTrueNumber(mins);
    s.innerHTML = getTrueNumber(secs);

    if (x <= 0) clearInterval(x);
}, 1000);

const getTrueNumber = x => (x < 10 ? "0" + x : x);